Chemical Identification
Common Name
Halfenprox
中文通用名
苄螨醚
IUPAC
2-(4-bromodifluoromethoxyphenyl)-2-methylpropyl 3-phenoxybenzyl ether
CAS
1-[[2-[4-(bromodifluoromethoxy)phenyl]-2-methylpropoxy]methyl]-3-phenoxybenzene
CAS No.
111872-58-3
Molecular Formula
C24H23BrF2O3
Molecular Structure
Category
Activity
Acaricide/Miticide
Halfenprox controls all motile forms of mites. It also inhibits egg hatch. The product acts by contact and ingestion. It has good knockdown activity, combined with residual activity lasting for up to six weeks.

In field trials, no russeting was noted on any of the apple cultivars tested.
CropUse
CropUses:
fruits, vegetables, tea, ornamentals

5-10 g ai/hl

Physical Properties
Molecular weight:477.3g/mol; Physical form:Colourless, clear liquid. Density:1.318 (20℃); Vapour pressure:7.79 ×10-4 mPa (25℃); Henry constant:7.44 Pa m3 mol-1 ( calc.); Solubility:In water 0.05 μg/l (25℃).; Stability:Degradation is <10% at 55℃. Stable in buffer solution ( pH 4, 7, 9).
Toxicology
Oral:Acute oral LD50 for male rats 132, female rats 159, male mice 146, female mice 121 mg/ kg. Percutaneous:Acute percutaneous LD50 for rats >2000 mg/ kg. Inhalation: LC50 (4 h) for male rats 1.38, female rats 0.36 mg/l. Phytotoxicity:No phytotoxicity has been observed at field use rates. ADI:6 mg/d (as carbon disulfide). 
Environmental Profile
Ecotoxicology: 
Bees: LC50 27 ppm.Birds: LD50 for bobwhite quail 1884 mg/ kg.Daphnia: LC50 (48 h) 0.031 μg/l.Fish: TLm (48 h) for carp 0.0035 mg/l.Worms: LC50 (7 d) 218 ppm. 

Environmental fate: 
Animals:From rats, the parent compound and 2-(4-bromodifluoromethoxyphenyl)-2-methylpropyl 3-(4-hydroxyphenoxy)benzyl ether are recovered.Soil: DT50 in soil c. 10 d.Plant:In tea, the parent compound and 2-(4-bromodifluoromethoxyphenyl)-2-methylpropyl 3-phenoxybenzoate are recovered.
Transport Information
Hazard Class:O (Obsolete as pesticide, not classified)

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